Fix webkitpy unit tests after 95547 and 95549

Fix webkitpy unit tests after 95547 and 95549
https://bugs.webkit.org/show_bug.cgi?id=68483

Patch by Leandro Pereira <leandro@profusion.mobi> on 2011-09-20
Reviewed by Adam Barth.

Fix tests for ChangeLog.touched_files() and ChangeLog.parse_entries_from_file().

* Scripts/webkitpy/common/checkout/changelog_unittest.py: While testing
parse_entries_from_file(), use StringIO and entry.reviewer_text().
While testing parse_latest_entry_from_file(), expect the correct
touched_files() list.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95583 268f45cc-cd09-0410-ab3c-d52691b4dbfc